|Publication number||US7011986 B2|
|Application number||US 10/962,979|
|Publication date||Mar 14, 2006|
|Filing date||Oct 12, 2004|
|Priority date||Apr 12, 2002|
|Also published as||DE10216267A1, DE10216267B4, US20050106785, WO2003086956A2, WO2003086956A3|
|Publication number||10962979, 962979, US 7011986 B2, US 7011986B2, US-B2-7011986, US7011986 B2, US7011986B2|
|Inventors||Frank Daeche, Hans-Joerg Timme|
|Original Assignee||Infineon Technologies Ag|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (21), Non-Patent Citations (1), Referenced by (11), Classifications (8), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of co-pending International Application No. PCT/EP03/02756, filed Mar. 17, 2003 which designated the United States and was not published in English, and which is based on German Application No. 102 16 267.0, filed Apr. 12, 2002, both of which applications are incorporated herein by reference.
1. Field of the Invention
The present invention relates to a method for manufacturing a housing for a chip with a micromechanical structure.
2. Description of the Related Art
Chips with micromechanical structures or so-called micromechanical circuits, respectively, have an increasing share of the market for high-frequency switches and high-frequency filters. One of the main markets for such chips with micromechanical structures is the mobile radio market. A chip having a micromechanical structure which is also referred to as a micromechanical circuit is a semiconductor device wherein a micromechanical structure is implemented on its surface. For such circuits individual housing technologies are required, wherein the housing needs to determine a cavity around the micromechanical structure.
A conventional proceeding in the prior art for housing a chip with a micromechanical structure is to use ceramic housing elements with a cavity. These ceramic housing patterns are both too expensive and also too large for technological requirements resulting today. Typical dimensions of such ceramic housings for a chip with a micromechanical structure are about 3 mm×3 mm×1.3 mm. These dimensions may not be further reduced with the conventional ceramic housing technologies.
Based on this prior art, it is the object of the present invention to provide a method for manufacturing a housing for a chip with a micromechanical structure which is no longer subject to the cost and size related restrictions of prior housing technologies.
According to a first aspect of the inventive method a first photolithographically patternable layer within a partial area of the main face of the base is applied and photolithographically patterned on a basis with first contact elements on a first main face in order to expose the first contact elements. A second photolithographically patternable layer is applied to the main face of a chip with a micromechanical structure which is arranged on the main face between second contact elements. By a suitable photolithographical patterning a recess surrounded by a wall is formed within the second layer, wherein the second contact elements are exposed. Then the base and the chip are joined such that the main face of the chip and the main face of the base are facing each other and that respective first and second contact elements are connected to each other. Finally, the base is removed in order to expose the first contact elements at the exposed main face of the first photolithographical layer.
According to a further aspect of the present invention, a method for manufacturing a housing for a chip with a micromechanical structure is provided which starts off with a basis with first contact elements and a plate element on a main face of the base. A chip with a micromechanical structure which is arranged at a main face of the chip between second contact elements is provided with a photolithographically patternable layer on at least one partial area of the main face of the chip. Then, a photolithographical patterning of this layer is performed for generating a recess surrounded by a wall in the layer in the area of the micromechanical structure and for exposing the second contact elements. Subsequently, the base and the chip are joined such that the main face of the chip and the main face of the base are facing each other, the plate element abuts the wall and covers the recess and respective first and second contact elements are connected to each other. Subsequently, the base for exposing the first contact elements is removed. In this variant of the inventive method, the plate element, preferably formed by a large-area metal island on the base, may form the later “lid” of the recess in the photolithographically patterned layer, so that in this variant of the inventive method the photolithographically patterned layer on the base may be omitted, although it is also conceivable to cover the plate element with a photolithographically patternable layer by applying a photolithographically patternable layer on the base after providing the same with the first contact elements and the plate element, wherein the photolithographically patternable layer is then patterned in order to expose the contact elements of the base.
These and other objects and features of the present invention will become clear from the following description taken in conjunction with the accompanying drawings, in which:
As it is shown in
As it is shown in
The method steps which are now to be explained with reference to
As it is shown in
In the method step shown in
As it is illustrated in
As it is shown in
In the first implementation of the inventive method discussed here, the wall 10 together with the second epoxy layer 9 forms the recess 11 in the form of a closed cavity which surrounds the micromechanical structure 6. In the following method step shown in
In the final method step shown in
As it is explained in
After performing the copper etch step described with reference to
In the method described above with reference to
In the embodiment of the inventive method to be described now with reference to
As it is shown in
With this implementation of the inventive method it is possible, however not absolutely necessary, to spin a photolithographically patternable epoxy layer onto the base shown in
One modification of the implementation of the inventive method described above with reference to
In the above-described method a base consisting of copper is assumed. As the base only represents a sacrificial pattern, any other easily removable material instead of copper, preferably a material removable by etching, may be used.
For the metal islands and contact bumps, instead of the use of nickel as a base material with gold plating as a coating, any other contact materials may be used.
In the described preferred embodiments, photolithographically patternable layers consist of a photosensitive epoxy material which is even removed or remains by illuminating or not illuminating, respectively, of parts of the epoxy material. At the same time it is possible, however, to form the photolithographically patternable layers by any etchable materials covered by photo masks.
In deviation of the above-described preferred embodiments, a sheathing of the manufactured housing pattern using vacuum screen printing or reprinting may be performed.
While this invention has been described in terms of several preferred embodiments, there are alterations, permutations, and equivalents which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the methods and compositions of the present invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention.
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|U.S. Classification||438/106, 438/125, 438/456|
|International Classification||B81B7/00, H01L21/44|
|Cooperative Classification||B81C1/00333, H01L2924/0002|
|Jan 21, 2005||AS||Assignment|
Owner name: INFINEON TECHNOLOGIES AG, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DAECHE, FRANK;TIMME, HANS-JOERG;REEL/FRAME:015617/0577;SIGNING DATES FROM 20041021 TO 20041029
|Sep 11, 2009||FPAY||Fee payment|
Year of fee payment: 4
|Mar 15, 2013||FPAY||Fee payment|
Year of fee payment: 8